PCF8574 I2C LCD Interface Module – 2-Wire I2C Adapter for 16×2 and 20×4 Character LCDs

🔌 PCF8574 I2C LCD Interface Module – 2-Wire I2C Adapter for 16×2 and 20×4 Character LCDs

The PCF8574 I2C LCD Module is a smart adapter board that converts standard parallel-interface character LCDs (like 16×2 and 20×4 displays) to I2C communication, dramatically reducing the number of GPIO pins needed to control them. Using this module, you can control an entire LCD with just two pins (SCL & SDA), freeing up valuable I/O for other sensors or devices.

Based on the PCF8574 I/O expander IC, this module is fully compatible with Arduino, ESP32, Raspberry Pi, and other I2C-capable microcontrollers. It is widely supported by popular libraries such as LiquidCrystal_I2C, making it easy to integrate into new or existing projects.

---

✅ Key Features:

• 📟 Compatible Displays: 16×2 and 20×4 character LCDs (HD44780 driver)

• 🧠 IC Used: PCF8574 (I2C to parallel I/O expander)

• 🌐 Interface: I2C (SCL, SDA)

• 📐 I2C Address: Configurable via onboard solder jumpers (Default: 0x27 or 0x3F)

• 🔋 Operating Voltage: 5V

• 🔧 Contrast Adjustment: Onboard potentiometer

• 💡 Backlight Control: Can be turned ON/OFF via code

• 📎 Pins Used: Only 2 GPIO pins required

• 🧩 Breadboard-Friendly: Easy integration into any project

---

🧰 Applications:

• I2C-enabled character LCD displays

• Arduino or ESP32 data display panels

• Smart sensors with LCD output

• Robotics status screens

• DIY weather stations and clocks

• IoT dashboards with minimal wiring

---

🔗 Why Choose This Module?

The PCF8574 I2C LCD Module is a must-have for any maker looking to simplify wiring and save GPIO pins. It’s the easiest way to integrate a character LCD into I2C-based systems, especially when using microcontrollers with limited pin counts.

---

📦 Package Includes:

• 1 x PCF8574 I2C LCD Interface Module

Note: Character LCD (16×2 or 20×4) sold separately.

---

🔍 Keywords:

PCF8574 LCD module, I2C LCD adapter, Arduino LCD I2C interface, I2C 16×2 LCD converter, LCD backpack module, I2C display module Pakistan, LiquidCrystal I2C module, character LCD I2C board.